Onitsuka Tiger Mexico 66 size 37.5

Brand new Onitsuka Tiger's bought in London,UK. Unfortunately I need a 37. The 37.5 are slightly too big. I was flying carrying on so I don't have the original box. Checkout link to the product here: https://www.onitsukatiger.com/gb/en-gb/mexico-66/p/1183c102-100.html